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Equity Compensation (Range) (Details)
3 Months Ended
Mar. 31, 2017
$ / shares
shares
Options Outstanding  
Number of Underlying Shares | shares 3,282,428
Options Exercisable  
Number of Underlying Shares | shares 2,678,355
3.38-6.14  
Equity compensation  
Range of Exercise Price, low end of range (in dollars per share) $ 3.38
Range of Exercise Price, high end of range (in dollars per share) 6.14
Options Outstanding  
Weighted Average Exercise Price (in dollars per share) $ 5.92
Number of Underlying Shares | shares 964,352
Weighted-Average Remaining Contractual Life 4 years
Options Exercisable  
Number of Underlying Shares | shares 964,352
Weighted-Average Remaining Contractual Life 4 years
6.34-9.93  
Equity compensation  
Range of Exercise Price, low end of range (in dollars per share) $ 6.34
Range of Exercise Price, high end of range (in dollars per share) 9.93
Options Outstanding  
Weighted Average Exercise Price (in dollars per share) $ 8.57
Number of Underlying Shares | shares 627,739
Weighted-Average Remaining Contractual Life 5 years 10 months 24 days
Options Exercisable  
Number of Underlying Shares | shares 529,726
Weighted-Average Remaining Contractual Life 5 years 4 months 24 days
11.28-16.97  
Equity compensation  
Range of Exercise Price, low end of range (in dollars per share) $ 11.28
Range of Exercise Price, high end of range (in dollars per share) 16.97
Options Outstanding  
Weighted Average Exercise Price (in dollars per share) $ 13.88
Number of Underlying Shares | shares 1,036,951
Weighted-Average Remaining Contractual Life 6 years 10 months 24 days
Options Exercisable  
Number of Underlying Shares | shares 670,482
Weighted-Average Remaining Contractual Life 6 years 7 months 6 days
17.66-22.92  
Equity compensation  
Range of Exercise Price, low end of range (in dollars per share) $ 17.66
Range of Exercise Price, high end of range (in dollars per share) 22.92
Options Outstanding  
Weighted Average Exercise Price (in dollars per share) $ 20.98
Number of Underlying Shares | shares 653,386
Weighted-Average Remaining Contractual Life 6 years 8 months 12 days
Options Exercisable  
Number of Underlying Shares | shares 513,795
Weighted-Average Remaining Contractual Life 6 years 8 months 12 days